Reproduction forbidden without Fibocom Wireless Inc. written authorization - All Rights Reserved.
L816-AM Hardware User Manual
Page 31 of 42
3.6.1
FW_Ready
Firmware ready is a modem driven GPIO, which on power on reset, it should be low. Once the firmware in
the modem is ready after boot, it should assert (high) GPIO. In an unlikely event of a firmware/modem
crash, if a crash/exception handler is to be run, FW ready GPIO should be de-asserted.
FW_Ready timing is shown in Figure 3-6
，
3-7
，
3-9
。
3.6.2
SMS_Ready
SMS ready is a modem driven GPIO, which should be low while power up/off and reset sequences.
Whenever modem receives an SMS from the network, it should assert (high) GPIO during 100msec, then
de-assert (low).
SMS ready GPIO should be triggered by non-class 2 “SIM card data” messages regardless message
storage status (even the storage is full and not be able to store new received message).
SMS_Ready timing is shown in Figure 3-13:
Figure 3-13 SMS_Ready Timing
3.6.3 Wakeup_Host
The Wakeup_Host signal is used to wake the Host (AP) when there is an incoming call, SMS or other data
requests. The definition of Wakeup_Host signal is as follows:
Operating Mode
Wakeup_Host Signal
Ringing /SMS or data requests
Pull high 100ms then pull low (pulse signal).
Idle/Sleep
low level
Wakeup_Host timing is shown in Figure 3-14:
Figure 3-14 Wakeup_Host Timing
